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The Scientific World Journal
Volume 2013, Article ID 808574, 9 pages
http://dx.doi.org/10.1155/2013/808574
Research Article

Analytical and Experimental Analysis of a Free Link in Contact with a Granular Medium

Mechanical Engineering Department, Auburn University, 1418 Wiggins Hall, Auburn, AL 36849, USA

Received 5 August 2013; Accepted 9 September 2013

Academic Editors: C. Bao and B. Yasilata

Copyright © 2013 Dan B. Marghitu and Seung Lee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, the experimental and the simulation results for a planar free link impacting a granular medium are analyzed. The resistance force of the granular medium on the body from the moment of the impact until the body stops is very important. Horizontal and vertical static resistance forces developed by theoretical and empirical approaches are considered. The penetrating depth of the impacting end of the free link increases with the increase of the initial impacting velocity. We define the stopping time as the time interval from the moment of impact until the vertical velocity of the link end is zero. The stopping time of the end decreases as the initial velocity increases. The faster the end of the link impacts the surface of the granular medium, the sooner it will come to a stop. This phenomenon involves how rapidly a free link strikes the granular medium and how it slows down upon contact.